package com.haust.community.controller;

import com.google.code.kaptcha.Producer;
import com.haust.community.pojo.User;
import com.haust.community.service.UserService;
import com.haust.community.utils.CommunityConstant;
import com.haust.community.utils.CommunityUtil;
import com.haust.community.utils.RedisKeyUtil;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.CookieValue;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import javax.imageio.ImageIO;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * @Auther: csp1999
 * @Date: 2020/11/24/14:55
 * @Description: 登录/注册 controller
 */
@Controller
public class LoginController implements CommunityConstant {

    private static final Logger logger = LoggerFactory.getLogger(LoginController.class);

    @Autowired
    private UserService userService;

    @Autowired
    private Producer kaptchaProducer;

    @Value("${server.servlet.context-path}")
    private String contextPath;

    @Autowired
    private RedisTemplate redisTemplate;

    /**
     * 注册页面
     *
     * @return
     */
    @RequestMapping(path = "/register", method = RequestMethod.GET)
    public String getRegisterPage() {
        return "/site/register";
    }

    /**
     * 登录页面
     *
     * @return
     */
    @RequestMapping(path = "/login", method = RequestMethod.GET)
    public String getLoginPage() {
        return "/site/login";
    }

    /**
     * 新用户注册操作
     *
     * @param model
     * @param user
     * @return
     */
    @RequestMapping(path = "/register", method = RequestMethod.POST)
    public String register(Model model, User user) {
        Map<String, Object> map = userService.register(user);
        if (map == null || map.isEmpty()) {
            model.addAttribute("msg", "注册成功,我们已经向您的邮箱发送了一封激活邮件,请尽快激活!");
            model.addAttribute("target", "/index");
            return "/site/operate-result";
        } else {
            model.addAttribute("usernameMsg", map.get("usernameMsg"));
            model.addAttribute("passwordMsg", map.get("passwordMsg"));
            model.addAttribute("emailMsg", map.get("emailMsg"));
            return "/site/register";
        }
    }

    /**
     * 用户激活操作
     * <p>
     * http://csp1999.natapp1.cc/community/activation/101/code
     *
     * @param model
     * @param userId
     * @param code
     * @return
     */
    @RequestMapping(path = "/activation/{userId}/{code}", method = RequestMethod.GET)
    public String activation(Model model, @PathVariable("userId") int userId,
                             @PathVariable("code") String code) {
        int result = userService.activation(userId, code);
        if (result == ACTIVATION_SUCCESS) {
            model.addAttribute("msg", "激活成功,您的账号已经可以正常使用了!");
            model.addAttribute("target", "/login");
        } else if (result == ACTIVATION_REPEAT) {
            model.addAttribute("msg", "无效操作,该账号已经激活过了!");
            model.addAttribute("target", "/index");
        } else {
            model.addAttribute("msg", "激活失败,您提供的激活码不正确!");
            model.addAttribute("target", "/index");
        }
        return "/site/operate-result";
    }

    /**
     * 验证码生成
     *
     * @param response
     * @param session
     */
    @RequestMapping(path = "/kaptcha", method = RequestMethod.GET)
    public void getKaptcha(HttpServletResponse response, HttpSession session) {
        // 生成验证码
        String text = kaptchaProducer.createText();
        BufferedImage image = kaptchaProducer.createImage(text);

        // 将验证码存入session
        //session.setAttribute("kaptcha", text);

        // 验证码的归属者
        String kaptchaOwner = CommunityUtil.generateUUID();
        Cookie cookie = new Cookie("kaptchaOwner", kaptchaOwner);
        cookie.setMaxAge(120);// cookie生存时间120s
        cookie.setPath(contextPath);
        response.addCookie(cookie);

        // 将验证码存入Redis
        String redisKey = RedisKeyUtil.getKaptchaKey(kaptchaOwner);
        redisTemplate.opsForValue().set(redisKey, text, 120, TimeUnit.SECONDS);

        // 将突图片输出给浏览器
        response.setContentType("image/png");
        try {
            OutputStream os = response.getOutputStream();
            ImageIO.write(image, "png", os);
        } catch (IOException e) {
            logger.error("响应验证码失败: " + e.getMessage());
        }
    }

    /**
     * 登录操作
     *
     * @param username     用户名
     * @param password     密码
     * @param code         验证码
     * @param rememberme   记住密码: true/false
     * @param model
     * @param /session     验证码存 session
     * @param response     通过 response 获取 cookie ---> 登录凭证存入 cookie
     * @param kaptchaOwner 验证码拥有者
     * @return
     */
    @RequestMapping(path = "/login", method = RequestMethod.POST)
    public String login(String username, String password, String code, boolean rememberme,
                        Model model, /*HttpSession session,*/
                        HttpServletResponse response,
                        // 从cookie 取值
                        @CookieValue("kaptchaOwner") String kaptchaOwner) {
        //System.out.println("===cookie:" + kaptchaOwner + "===");

        // 检查验证码
        //String kaptcha = (String) session.getAttribute("kaptcha");
        String kaptcha = null;
        if (StringUtils.isNotBlank(kaptchaOwner)) {
            String redisKey = RedisKeyUtil.getKaptchaKey(kaptchaOwner);
            // 从 Redis 中取出验证码
            kaptcha = (String) redisTemplate.opsForValue().get(redisKey);
            System.out.println("===redis:" + kaptcha + "===");
        }

        if (StringUtils.isBlank(kaptcha) || StringUtils.isBlank(code) || !kaptcha.equalsIgnoreCase(code)) {
            model.addAttribute("codeMsg", "验证码不正确!");
            return "/site/login";
        }

        // 检查账号,密码 ---> rememberme 勾选记住我(true) 设为较长过期时间30day,反之(false)设为默认超时时间12h
        int expiredSeconds = rememberme ? REMEMBER_EXPIRED_SECONDS : DEFAULT_EXPIRED_SECONDS;
        Map<String, Object> map = userService.login(username, password, expiredSeconds);
        if (map.containsKey("ticket")) {
            // 登录凭证存入cookie
            Cookie cookie = new Cookie("ticket", map.get("ticket").toString());
            cookie.setPath(contextPath);
            cookie.setMaxAge(expiredSeconds);// 设置 cookie 有效时间
            // 将cookie返回给浏览器客户端
            response.addCookie(cookie);
            return "redirect:/index";
        } else {
            model.addAttribute("usernameMsg", map.get("usernameMsg"));
            model.addAttribute("passwordMsg", map.get("passwordMsg"));
            return "/site/login";
        }
    }

    /**
     * 登出操作
     *
     * @param ticket
     * @return
     */
    @RequestMapping(path = "/logout", method = RequestMethod.GET)
    public String logout(@CookieValue("ticket") String ticket) {
        userService.logout(ticket);
        // 从并存入SecurityContext 清除登录凭证数据
        SecurityContextHolder.clearContext();
        return "redirect:/login";
    }
}
